The Seiko S240-400B is a watch model based on the S240 movement.
Parts List
| ESFW31LM02 | crystal |
| RE3W25LM01 | crystal |
| 0F335BEA1 | case back gasket - case back gasket |
| 86592216 | crystal gasket |
| 80630037 | pusher |
| AD006BAA1 | pusher - button gasket |
| AL27B | band - leather band |
| S24010 | others - machine code |
| S240400BN2 | others - case |
| S2404000 | others - case back |
| 86510551 | others - conducting plate |
| A170CS | others - push pin |
| 81350760 | others - button spring (front) |
| 81350809 | others - button spring |
| 83200211 | others - button spring clip |
| 81503199 | others - case back screw |
Other models with the same movement